Oil displacement effect reservoir influencing factors analysis of air foam flooding technology in Block M
In order to systematically evaluate the oil displacement effect of air foam flooding technology in M block,49 air foam injection well groups in M block were selected to analyze the decline rate and water control effect.The effects of reservoir factors on the efficiency of oil well are analyzed by dividing each layer single sand body by log-ging curves.The results show that the air foam flooding has a good effect on oil stability and water control,88%of the production wells benefit from foam flooding,and the water cut is stable and decreased,and the oil stabilization effect is obvious.The ineffective wells are greatly affected by the distribution of single sand bodies,mainly distributed at the edges of single sand bodies.Reservoir permeability affects the oil displacement effect of air foam flooding.Even for connected reservoirs,the oil displacement effect is not ideal when the reservoir permeability is lower than a certain value.The reservoir heterogeneity affects the oil displacement effect,and the reservoir with strong heterogeneity has obvious good effect after air foam flooding.Foam flooding injection wells should be selected as far as possible in the main channel sand bodies with good connectivity and physical properties,especially in wells with rapid water cut rise caused by heterogeneity,and the displacement effect is more obvious.Due to poor connectivity and low permeability,the oil displacement effect of the well group at the edge of a single sand body will be greatly reduced.The research can provide technical reference for the popularization of air foam flooding technology in low permeability oilfield.
air foam floodingsingle sand bodyultra low permeability oilfieldheterogeneityYanchang oilfield
万方数据
维普
